Dishwasher tub construction



Nov. 29, 1949 R. w. FRANKLIN DISHWASHER TUB CONSTRUCTION 2 Sheets-Sheet 1 Filed Jan. 25, 1946 IIIIl WEI--- Nov. 29, 1949 'R. w. FRANKLIN DISHWASHER TUB CONSTRUCTION 2 Sheets-Sheet 2 Filed Jan. 25, 1946 Patented Nov. 29, 1949 UNITED STATES PATENT OFFICE DISHWASHER TUB CONSTRUCTION Ray W. Franklin, Chicago, 111. Application January 25', 1946, Serial No. 643,349

12 Claims.

This invention relates to dish washers and particularly tub constructions therefor.

A diiiiculty met with in previously existing forms of. washers is that deep drawing of metal, which is necessary to form a deep tub of one piece. is an expensive process.

Another difliculty encountered in prior dish washers concerns the forming of channels or conduits in the tub. It is usual and desirable to provide'some form of channel for conducting the wash water from the bottom of the washer to or near'the top and directing it onto the dishes. Some washers are constructed with separate conduits leading, for example, outside of the tub to the top;' others are constructed by stamping troughsin the side wall and enclosing the troughs with covering strips to form enclosed channels.

Theformer method of forming channels is too costly in materials and time, and the latter requires too expensive a stamping operation.

My invention is designed to overcome all of these difficulties. The first mentioned difiiculty, that is, deep drawing, is overcome by forming the tub of my invention of two pieces, a bottom piece which isfshallow and can .be formed by a simple operation, and a separate piece forming the side wall which can also be formed by a simple operation. The side wall is then fitted to the bottom piece and soldered to it forming a unitary, deep tub.

The second difilculty, which concerns forming the channels or conduits, is overcome by a special construction which eliminates the necessity of stamping troughs in the side wall. The tub ispreferably polygonal in shape rather than circular. One advantage of this shape is that the side wall, which is formed of a single piece, can be shaped by a simple operation of breaking the metal to form straight sides angled with respect to each other. The bottom piece is stamped with open troughs therein, which can be accomplished by a simple operation because the bottom piece is shallow. Channel covering strips are then se-' cured over the open sides of the troughs in the bottom piece and are continued upwardly on the side wall forming vertical channels between the covering strips and the side wall.

An advantage of this arrangement is that the channels need not be water tight since they are on the inside of the washer, but the contact between straight strips of metal constitutes a closure sufiicient to conduct water to the upper part of the washer. The strips are soldered to the interior of the tub at intervals for securing them in position.

w a means for preventing objects, such as pieces of silverware, from falling into the impeller. This comprises a dome shaped cover over the impeller and provided with openings which are ample for thorough circulation of water but which are provided with shields covering the openings from above and open to the side.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my device whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in the claims, and illustrated in the accompanying drawings, in which:

Fig. l is a plan view of a wash tub, with parts broken away;

Fig. 2 is a vertical sectional view on an enlarged scale, taken on line 22 of Fig. 1;

.- Fig. 3 is a sectional view taken on line 3-3 of Fig. 2;

Fig. 4 is a sectional view taken on line 4-4 of Fig. 2;

Fig. 4a is an enlarged view of that portion of Fig. 4 encircled in dot-dash lines;

Fig. 5 is a sectional view taken on line 5--5 of Fig. 2;

Fig. 6 is a perspective view of the side wall of the tub;

Fig. '7 is a perspective view of the bottom piece of the tub;

Fig. 8 is a perspective which is used for forming a channel bottom piece and wall of the tub;

Fig. 9 is a perspective view of another channel strip which is used in connection with the channel strip shown in Fig. 8; and

Fig. 10 is a vertical sectional view of a portion of a modified form of channel strip.

Referring now in detail to the drawings, the tub is shown as generally octagonal in shape, having alternate long and short sides, or similar to a square with the corners cut off. The shell of the tub comprises a bottom piece B into which is fitted a wall W of the same peripheral shape.

view of a channel strip with the The bottom piece 5 shaped from a flat piece of sheet metal by stamping, forming four shallow radial open troughs ll] which have inclined walls 52. At the point where the troughs ill meet is a plane area 14 of the same depth as the troughs it. This plane area 14 may be termed a center well for the operation of an impeller. Depressed from the central well I4 is a circular indentation It provided with a central circular opening. A low flange surrounding the entire bottom pieceis formed in the stamping operation and is shown, sections [8 along the long sides of the tub, and sections 20 along the short sides. At their outer ends the channels l8 curve upwardly and continue into the sections "20 of the low flange.

The side wall W comprising the upper part'of the tub is formed from a flat. piece of sheet metal and broken to generally octagonal shape to conform to the peripheral shape of the bottom piece B and comprises long sides 22 and short sides E i. A flange or-bead2$ i's-formed on the upper margin of theside wall W to strengthen it, and the ends of the whole pieceare secured in a seam :28. The side wall W-then fits on'the bottom piece B inside of the flange around the periphery of the bottom piece to complete the shell of the tub. The twopieces aresoldered or otherwise secured together in liquid ti'ght' relation.

Channel strips'A- are fitted on the inner surface of the tub to form'enclosed water channels therein. The lower orshort leg-3U of the channel strip A fits over "oneof the open troughs ii and the verticalor long leg 32- continues upwardly on the side wall along'the adjacent short side 24% thereof and contacts the adjoining long sides 22. The'edges of thepove'r piece are bent at an angle to the main part as indicated at 3 5. The portions 235 on theshort -leg *3fl'fit against the inclined walls'lT'of the trough-i (see Fig. and the portions 34"on the-long leg '32 engage the'long'si'des"22"of theside wall W (see Figs. 3 and 4). 'The 'angleportions 34 are soldered as indicatedatSS to secure the channel strip -A in place. The channel strip need not form'a liquid tight channel "withthe shell-of the tub since they need only to direct the main body of water passingthroughthem. The long leg 32 is providedwvith' an opening '36 approximately midway 'of i'ts height and another opening 38 near the top. I V

'Channel'st'rip C is of generally U=shape in cross section, and is bent at an angle lineally to confo'i'n'i'to the angle of thefcha'nnel'st'rip'A. The channel strip 0 is placed'b'etween the channel strip A and'theshellbf'the"tub"withits open side/toward the channel strip A. When thusin position, the horizontal leg"4ll"is disposed in the trough H] between the short leg 30 of the channel strip A and the bottom piece B (see Fig. 5) and the vertical leg 42 is. positioned between the long leg'32 of the channel strip A and the short side 2 :4 of the side 'Wallof'the'tub (see Figs. 3 and 4). The channel strip C is soldered at intervals to secure it in' place. The channel strip A forms an enclosed channel 46 eXt'ending from the center well l4 outwardly and continuing upwardly along the side wall of the tub; and the channel strip-C forms another channel, 48, disposed centrally of the channel 46, but channel 58 terminates midway up the wall of the tub. The upper end of the leg 42' of the channel strip C is curved as indicated-at to direct the water from the channel48 throughthe opening 36 into the interior of the tub. :A closure member 50' 4 closes the top of the channel 46 forcing the water from the channel 46 through opening 38 into the interior of the tub, and a baflle 5.2 is secured above the opening 38 to direct the water emerging therefrom slightly downwardly. An impeller 54 provided with a drive shaft 56, a bearing disc 58 and hub 60 is rotatably mounted in the center well M with its bearing disc 58 rotating in the circular depression Hi. This impeller may be driven by 'any-suitable' power means. Immediately above the'impeller"5'4 is a convex cover or dome 62 having a plurality of circum- -ferential openings 64 for the passage of the wash-water-through the openings 64 being covered by shields 66 for preventing silverware or other objects from falling into the impeller. It

will .be noted thatshields 66 cover the openings i ofopenings 86-:and shields 64 from above, but open outwardly. This arrangement effectively prevents objects from falling through the opening 64, while the shields 66 open in theproper :di-rection: fort facilitating circulation of the "wash-water. 'zsecured centrally'o'f the dome 62: is"a-verticallytextending= shaft housing fi8 adapted to support afibasket forcontainin'g dishes to be *washed. Formedon the -rnarginal edge of the dome 62 is a radially: extending supporting surface '10 havingza generallyupwardly or axially extendingrcurvedCguard fiange IZ. The bearing surface 70 :is-supported byand secured to a plate-M having aacentral 'op'ening-"lfitherein, the plate 741 resting on theibottoni piecaBat the upper level of v.the troug hs 1'0.

Surroundingthe gnard flange 'n is a horizontally disposed plate 18 having'a 'downturned edge 89 at its outermargih, :a:circu1a r:opemng 82in the center, and' 'a"downturnededge ii l around the margin ofthe open'ing 82. "The: opening-82 is greater: in diameter". than the-guard 'flange 72 to permit the plate 18"to='be: remove'd thereover. The plate l8vis space'd from ther'side walls 22 of the tub, as.shown -in F igfllpbut the dowi'itu'rned edge-- on the outer margin rests o'n the channel: strips-A at the: corners of the tub' as shown in Fig.2. ZThepIate M'is formed=with ai=plurality BBsQn' -th'e underside thereof i opening outwardly-from the center or the tub. The-plateia-is spaced from the bottom of .the' tub --formi'n'g az'space 89 -th'erewith for sediment.

On operation of the impeller the wash water is forced outwardlynand upwardly through the channelsifi and 48' aridfiemerges TrOmJth'e openings 36wand 38 into the; tub,:'as indicated by the arrows, and is directed to the lc'e'nter-onto' the dishes. "After the iwateri'ihas :beenthrown on I to the: dishes the tendencyidstovmove outwardly to theJPGL'iphGEY Of the tubtcarrying' particles of food from the relishes Withmit. i Ihisisedim'ent then filters downthroughppenings:821 and 86; the spaces between the plate '18 iandis'ide 'fi wall of the tub into the sediment I trap ":7 89. JiThe guard "-fla'n'ge 1'2 preventsany substantialuamount of water from the space 89-toi bei drawmout; andzthus the 'sdi'-' ment 'istrapped.-ir the spacer89. By 'this' means' substantially clean watercis used in the washing process and obviates the: necessity; for: frequent changing of the water.

In th'e modi-fiedvform shown in Eig."10, the channel' dfi ais providediwith a hori-z'ont'al 'ex'- tension 990 extending finwardly from I the outer edge 'of' thei'tubsasshort distance. The lower surface 92 thereof is? termed "integral w ith :the main' bodyisof.thet'channel strip A. iThe upper edge riof the 'shortsside-rzhof the;sidawallvoftthe tub is bent inwardly to direct the waterifromthe channel in that direction and terminates at 94. The extension 92 is provided with upturned sides 96 which extend the depth of the channel forming the sides of the channel along this stretch. A closure member 98 is secured along the top of the horizontal channel 9|] and is formed with downturned side portions which fit over the upturned sides 96. In this modification the opening 38 is of course eliminated. The inner end of the channel 90 is provided with a downturned baffle I02 to direct the water onto the dishes. By this modification more water is directed on the dishes from the top instead of from the sides thereby reaching areas not ordinarily reached.

The tub which I have illustrated and described is octagonal. This is not necessarily the only shape that is feasible, and it may be formed with a greater or lesser number of sides; and it may not even be polygonal, but circular. The channel covering strips can be of other shapes than that shown to cooperate with other shapes of tubs.

Although I have herein shown and described a preferred embodiment of my invention, manifestly it is susceptible of modification and rearrangement of parts without departing from the spirit and scope thereof. I do not, therefore, wish to be understood as limiting this invention to the precise form herein disclosed, except as I may be so limited by the appended claims.

I claim as follows:

1. A tub construction having a bottom, a side wall, and channel means secured to the interior of the tub forming channels in the bottom and continuing upwardly on the side wall, each channel means consisting of two channel strips, one surrounding and enclosing the other thereby forming two channels, the channel strips of each channel means terminating at different points, vertically, on the side wall, and there being an opening in the enclosing channel strip at the upper extremity of each channel and opening into the tub.

2. A tub having a polygonally shaped periphery, the sides of the tub being alternately long and short, channel means disposed vertically adjacent each short side on the interior of the tub, each channel means consisting of two channel strips one surrounding and enclosing the other, each enclosing channel strip being in contact with and secured to the two long sides adjacent their intermediate short side, thereby forming two vertically extending channels between each enclosing channel strip and its respective short side, the channel strips of each channel means terminating at different points, vertically, on the side wall, each enclosing channel strip having an opening therein at the upper extremity of each channel formed thereby communicating with the respective channel and opening into the tub.

3. A tub having a center well formed in its bottom for the reception and operation of an impeller, there being radially extending open troughs formed in the bottom of substantially the same depth as the center well and ext-ending therefrom to the periphery of the tub, and channel strips secured to the lateral edges of the troughs for closing the same, said channel strips extending upwardly along the side wall of the tub and being secured thereto, said channel strips forming enclosed vertical extensions of the channels formed in the bottom.

4. In a tub construction having a center well formed in the bottom thereof for the reception and operation of an impeller, a plate having a central opening therein secured in the tub and spaced from the bottom thereof, said plate having openings therein for the passage of water and solid particles therethrough, and baille means for preventing the flow of water from the space between said plate and the bottom of the tub into the impeller well.

5. A tub construction having a center well formed in the bottom thereof for the reception and operation of an impeller, a plate having a central opening therein secured in the tube and spaced from the bottom thereof, said plate having openings therein for the passage of water and solid particles therethrough, and vertically extending baflle means in the central opening in said plate and surrounding the impeller well for preventing the flow of water from the space between said plate and the bottom of the tub into the impeller well.

6. A tub construction having a center well formed in the bottom thereof for the reception and operation of an impeller, there being enclosed channels formed in the bottom of the tub extending radially from the impeller well and continuing upwardly on the side wall of the tub, said channels having openings therein in the upper part of the tub and directed inwardly, a horizontally disposed plate having a central opening therein secured in the tub and spaced from the bottom thereof, said plate havin openings therein for the passage of water and solid particles therethrough, and bafile means for preventing the flow of water in the space between the plate and the bottom of the tub from flowing into the impeller well.

'7. A tub construction, comprising, a center well formed in the bottom thereof, enclosed channels of substantially the same depth as the center well formed in the bottom of the tub communicating with the center well and extending outwardly therefrom, and vertically extending baille means surrounding the center well and the entrances into said channels for preventing the flow of water in the outer portion of the bottom of the tub from flowing into the center well.

8. A tub having radially extending open troughs formed in its bottom, said troughs having inclined side walls, and channel strips for enclosing said troughs, each channel strip having a horizontal leg and a vertical leg, the lateral edges of the horizontal leg of each channel strip being in contact with and secured to the inclined walls of the respective trough, and the lateral edges of the vertical leg of each channel strip being bent and in contact with and secured to the side wall, the upper end of the vertical leg having an opening therein.

9. In a tub construction, a piece having a bottom element and an upwardly extending flange around the periphery of the bottom element, said bottom element having open troughs stamped in the upper surface thereof, said troughs each having one end terminating adjacent said flange, a side wall formed of a single flat piece shaped to conform to the periphery of said bottom piece, the piece forming said side wall having its peripheral meeting edges secured together to form a continuous peripheral element and being secured to said flange to form a unitary tub, and channel strips secured to the interior of the tub enclosing said open troughs and forming channels with th side wall, said channels being in continuation of said troughs.

1 02A: tub: construction: having: centerwell forn'i'e'd in the bottom: thereof. for the reception: and operation ofa'n impeller;- a: plate having ar central opening there-in secured in: the tub and spaced from the bottom thle'oi, said central opening being disposed? OV'er S'alid center" well, said plate having openings therein tor" the passage of water and solid particles" therethr0ug'h-,- an annular plate of lesser dimension-than"- said central opening having its outer marginal edge seeured' to the bettom-o'f the tub and c'overing the outer portion of the impeller'well'; and Vertically extending baffle me'ans' secured' to the-outer marginal edge of the annular" plate and extending upwardly through tli'e central opening in the;- first platefor" preventing the ficw' or water-1 from the spa'c'e betweenthe first plate and" the bottom of the "tub into-the impeller well;

111- Means for forming channels in a-tub having a bottom, and'a 'sidewall disposed 'a-t an angle to the bottom, comprising in cbmbinaltion, a-fi'rst channel strip of U-shape' crosssection and formedas an angle'in' a" linear" direction thereby forming legs, the angle between said" legs con-- forming to the angl'e' bet'ween the bottom and-side Wall of the tub, an'd asecond channel strip formed as an angle in alinear direction thereby forming legs, the angle between said legs conforming to the anglebetween the bottom and" side wall of the tub; said first' channel strip adapted to be 3 ing leg: of the; first channel strip and having an" opening at the extremity thereof: and an opening:

at the extremity of i the first channel strip.-

121 Means for forming closed: channels in' an open trough: having a; bottom" surfacev and side surfaces, comprisin'g in combination, a first chairn'el strip of U-ShapflcPOssi section, of'less width' than the trough adapted to. bepositionedin the trough with its open: side directedupwardly, and, i a second channel stripa'dapted to? fit over and.

close the open sidev of the first channel strip and form a closed channel. therewith, the secondchannel strip'bein'g Wider than the-first channel strip,- and the lateral edges of the second chan- ;nel strip adapted to be secured to-the side surfacesof thetrough when in position closing the first channel strip, thereby forming a closed channel between the second channel strip and the trough, said" channel strips being of difierent' glen'gths for forming difierent terminal ends of the respective channels, said second channel strip having an opening at its terminal end and an opening at the terminal end of said first channel strip.

RAY WI REFERENCES CITED The following references are of record in the U the of this patent:

UNITED STATES PATENTS Number Name Date 83,251 Burtis Oct; 20, 1868 v v 1,167,357 Haas et a1. Jan. 4, 1916 1,597,395 Snater Aug.-24, 1926 1,629,391 Kemp et a1. May 17, 1927 1,878,685 Elkington Sept. 20, 1932 1,939,630 Pauly Dec. 12, 1933 W 1,996,654 Altorfer Apr. 2,.1935' 2,014,084 Kingsley etal Sept. 10, 1935 2,287,591 Adams June 23', 1 942 

